Heat-transmitting platen element



May v7, 1929- y F. w. HARNEY 1,712,386

HEAT TRANSMITTTNG PLATEN ELEMENT Filed April 19, 1928 /zls ATTORNEYS llatentecl May 7, 1929.

UNITED STATES PATENT OFFICE.

raaNors W. Annruvnv, OFLOOKPORT, NEW YOamAssroNoa Termini-SON COMPANY,

or tocxronfi,` NEW YORK, A CORPORATION or NEW YORK.

HEAT-TRANSMITTING PLATEN ELEMENT.

Application filed April 19, 1928. Serial No. 271,330.

My present invention relates to heat transfer, and more particularly to the construction of steam heated platens, and shaping elements useful, foi` instance, in the manufacture as a continuous process of sheets and boards, requiring heat treatment, such as composite wallboard used as building material. The invention has for its object to provide a simple, strong and reliable platen of this character.

To these and other ends the invention resides in certain improvements and combinations of parts, all as will be hereinafter more fully described, the novel features being pointed out in the claim at the end of the specification.

ln the drawings: lf ig. 1 is a top plan view of a heating and shaping platen constructed in accordance with and illustrating one embodiment of my invention Fig. 2 is an end view thereof with reference to the direction of travel of the product;

Fig. 3 is an enlarged fragmentary horizontal section taken through one end of the platen, substantially on the line 3--3 of lfig. 2;

Fig. 4 is a further enlarged detail fragmentary transverse section taken on the line H of Figs. l and 2, and

Fig. 5 is a transverse section taken on the line 5--5 of Fig. 2.

Similar reference numerals throughout the several views indicate the same parts.

Although applicable in other instances, the present invention has been designed in the embodiment shown to facilitate the manufacture of a particular type of wallboard for building construction, said wallboard embodying generally two facings or liners of paper enclosing an interior body of mineral material, the latter added for the purpose of strengthening and stiffening the board and also rendering it a water-resisting, a firemesisting, and sound-proof agent. An example of such a wallboard is one in which a mixture containing silicate of soda and dolomitic limestone is introduced between liner sheet-s and then heat treated at a temperature suthcient to intumesce the said mixture, and cause it, when hardened, to form a irm, cellular mass between the paper liners. The heat is applied and the ultimate thickness of the boa-rd determined by drawing it through a plurality of steam, or otherwise heated platens arranged in opposed and suitably spaced sets. y

This invention has to do with the construction of the platen units per se and it has therefore been deemed unnecessary to give a showing of a complete machine of this character, as long as the utility of the present invention can be explained in the foregoing general way. Y

Referring more particularly to the draw'- ings, each platen unit, of which a multiplicity are used lin a complete machine, comprises a block or face plate l of cast iron or other appropriate metal having extensions 2 at the side provided with perforations 3 for suitably mounting them in the bed of the machine. The face of this block or plate which comes in contact with the material acted upon is indicated at 2. On the oppo site or back side of the plate there are partially imbedded or submerged therein a plu rality of parallel steam pipes 4C connected in communicating pairs at their ends by elbows 5, or equivalent fittings so that a continuous circulating steam passage is produced through all of the pipes proceeding from an intake connection 6 in the first pipe of the series to an exhaust connection 7 at one end of the last pipe. These pipes and their elbows are preferably first joined and connected in a steam tight manner by pencil-welding as indicated at 8.

In the manufacture of the platen I proceed in the manner of first thus welding the pipes and elbows together as described; sand blasting the under sides or surfaces thereof as indicated at 9 in Fig. 4 to insure a perfect bond and then exposing such sand blasted sides in a mold in the manner of a core. I then cast the face plate into the mold, whereby the pipes are partially fused and attached thereto in the partially submerged relationship shown.

The resulting structure is one in which the face plate casting l maintains its strength and resists warping under the working temperatures between 125 and 200 pounds steam pressure to which the platen is subjected in use, and yet the bond between the steam transmitting pipes and the plate 2 f f l 1,712,386

` through which this heat is transmitted to the product is so intimate as to insure a perfect heatingof the plates to the desired degree.

VI claim as my invention:

A method of making heat transferring platens which consistsl in sand blasting one side of a plurality of steam pipes, exposing such sand blasted sides in a mold in the manner of a core and casting a face plate in 10 the mold whereby the plpes are partially fused and attached thereto in a partially submerged relatonshi FRAN IS W. HARNEY. 

